Headset/amplifier interface adaptor



FIG. 1 is a plan view of a headset/amplifier interface adaptor showing our new design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a back view thereof. 

The ornamental design for a headset/amplifier interface adaptor, as shown and described. 